petsc: remove no longer needed -Qunused-arguments hack

var/spack/repos/builtin/packages/petsc/package.py

@@ -71,19 +71,10 @@ def mpi_dependent_options(self):
                 errors = ['incompatible variants given'] + errors
                 raise RuntimeError('\n'.join(errors))
         else:
-            if self.compiler.name == "clang":
-                compiler_opts = [
-                    '--with-mpi=1',
-                    '--with-cc=%s  -Qunused-arguments' % join_path(self.spec['mpi'].prefix.bin, 'mpicc'), # Avoid confusing PETSc config by clang: warning: argument unused during compilation
-                    '--with-cxx=%s -Qunused-arguments' % join_path(self.spec['mpi'].prefix.bin, 'mpic++'),
-                    '--with-fc=%s' % join_path(self.spec['mpi'].prefix.bin, 'mpif90'),
-                    '--with-f77=%s' % join_path(self.spec['mpi'].prefix.bin, 'mpif77'),
-                ]
-            else:
-                compiler_opts = [
-                    '--with-mpi=1',
-                    '--with-mpi-dir=%s' % self.spec['mpi'].prefix,
-                ]
+            compiler_opts = [
+                '--with-mpi=1',
+                '--with-mpi-dir=%s' % self.spec['mpi'].prefix,
+            ]
         return compiler_opts
 
     def install(self, spec, prefix):